Egis 15A Blue Blade Manual-Reset Circuit Breaker

This is the Egis Mobile Electric 472015, a 15 amp blade-style circuit breaker built to drop into the company's MT Series sealed fuse blocks. It protects a single circuit, and it resets by hand. Think of it as a fuse you never have to replace. When a circuit pulls more current than it should, the breaker trips and cuts power. Once you sort out what caused the fault, you reset it and you're back in business.

The blue blade tells you the rating at a glance. On a boat with a dozen circuits packed into one fuse block, color coding matters. Blue is the standard color for 15 amps, so you can confirm you've got the right breaker in the right slot without pulling it and squinting at tiny print. The breaker carries a 28 volt DC rating, which means it's happy on both 12 volt and 24 volt systems. Most boats run 12 volt house and engine circuits, and plenty of larger rigs run 24 volt gear, so one part number covers both.

Here's why a lot of boaters prefer a resettable breaker over a plain fuse. Fuses are cheap and they work, but when one blows you need a spare in the right rating, and you need to find it, usually at the worst possible time. A manual-reset breaker skips all that. It's the same footprint as the fuse it replaces, it drops into the same block, and when it trips you just push it back. Manual reset also means it stays off until you deal with the problem. It won't quietly cycle back on while there's still a short in the wiring, which is exactly what you want for a fault you haven't found yet. In the industry this manual-reset style is classified as a Type III breaker.

And when it does trip, treat it as information. A breaker that pops once might just be a momentary overload, like a pump fighting a clog. A breaker that trips again the moment you reset it is telling you there's a real fault, a chafed wire, a pinched lead, or a failing device, and it's worth tracking down before you keep resetting. That feedback is part of what makes a breaker nicer to live with than a fuse.

These breakers are made for the Egis MT Series sealed fuse blocks, the connectorized blocks Egis builds for marine and specialty-vehicle use. Those blocks seal against spray and moisture, use stainless hardware, and give you blown-circuit indication, so pairing them with blade breakers that reset by hand keeps a helm or console panel clean and serviceable. If you're already running an MT Series block, this is the part that fits the slots natively.

A 15 amp circuit covers a lot of common gear. Cabin and cockpit lighting, a small bilge or washdown pump, a stereo head unit, a chartplotter or fishfinder, charging ports, and similar accessory loads usually land in this range. The breaker protects the wire, not the device, so size your wiring to the breaker. For a 15 amp circuit, 14 gauge wire is the common choice for shorter runs, and you step up to heavier wire as the run gets longer to keep voltage drop in check. When in doubt, follow ABYC wire-sizing guidance for the length and location of the run.

Egis Mobile Electric has been building vehicle and marine electrical gear for over 25 years, and the MT system reflects that. This single 15 amp breaker is a straightforward part. It's the right call when you're building out an MT Series block, replacing a tripped unit, or swapping a fuse for something you can reset without digging through a spares kit. Buy the amperage that matches the circuit, confirm the blue blade, and you're set.